Classifications

• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/945—Proximity switches

Definitions

• the invention relates to a circuit arrangement for monitoring the fault-free and / or for recognizing a faulty state of a cable car or chair lift system according to the preamble of claim 1.
• the safety-relevant criterion is to check the position of the cable relative to the cable pulleys carrying or guiding the cable. If the actual position of the rope relative to at least one rope pulley does not correspond to the target position, safety-relevant measures must be taken. If there is a slight deviation between the actual position of the rope and its target position, the safety-related measure derived from this can be a reduction in the rope speed. If the deviation between the actual position of the rope and the target position exceeds a predetermined limit value, the safety-relevant measure in any case consists in the fact that the cable car system or the chair lift system is stopped immediately.
• control intervention in an assigned system only takes place when a - sufficiently large - control current flows in the control circuit.
• the prerequisite for this is that, on the one hand, the necessary operating voltage is available, on the other hand there is no line break and that the switching device in such a control circuit, designed as a make contact, is finally functional.On the contrary, in the case of a control circuit operating according to the quiescent current principle, it is then converted into an associated one System intervenes to control if no control current flows in the control circuit.
• control circuits functioning according to the open-circuit principle that is to say in the case of control circuits in which the switching devices are designed as NO contacts, the switching devices are connected in parallel; after actuation of a switching device designed as a make contact, the control circuit becomes effective as a whole.
• control circuits functioning according to the closed-circuit current principle that is to say in the case of control circuits in which the switching devices are designed as break contacts, the switching devices are connected in series; after actuation of a switching device designed as a break contact, the control circuit is de-energized and thus effective overall.
• a displacement detector and a monitoring arrangement for lift systems are known from US Pat. No. 5,581,180, in which the displacement detector having a Hall sensor supplies an analog output signal proportional to the degree of displacement of the rope to be monitored. Depending on the degree of displacement of the rope relative to a predetermined position, the speed of the motor of the lift system is controlled, the motor being stopped completely from a certain value of the degree of displacement.
• the present invention is based on the object of designing a circuit arrangement of the type described so that the monitoring has particularly high security requirements fulfilled and can also be used with only a small installation space.
• each proximity switch has several different spatial influencing areas and several signal outputs.
• the area of influence is understood to mean that spatial area at a distance from the proximity switch within which the presence or absence of a monitored object in the proximity switch leads to a change in state.
• the area of influence is the area over the active surface of the proximity switch in which the proximity switch responds to the proximity of damping material, i.e. the proximity switch. H. an ordinary proximity switch has exactly one area of influence.
• each proximity switch has a plurality of spatially different areas of influence, accurate and selective monitoring of the state of the system is possible.
• the deterioration of the faultless state can also be recognized and the occurrence of a faulty state can thus be avoided by taking appropriate measures.
• the proximity switches have a control input and a control output, the control output of the (n-1) -th proximity switch being connected to the control input of the n-th proximity switch.
• This achieves the series connection of the proximity switches, which is necessary for safety reasons, and on the other hand prevents the voltage drops at the proximity switches from adding up.
• the control input of the first proximity switch is connected to the control and evaluation unit and is acted upon by this with a clocked, preferably cyclically reprogrammed signal.
• the proximity switches in the circuit arrangement according to the invention can not only be queried with regard to their state, in particular their switching state, but can also be addressed.
• each individual proximity switch is individualized in that a specific address is assigned to it.
• the proximity switch individualized by its address is therefore “addressed” and then its state, in the case of a switching device, its switching state, is queried.
• the proximity switches and the control and evaluation unit form a ring with regard to the possibility of interrogation and addressing via corresponding connecting lines.
• the addresses and information are only transmitted in one direction via the connecting lines, specifically against the direction of transmission of the clocked signal fed by the control and evaluation unit into the control input of the first proximity switch.
• the failure of a proximity switch or the breakage of a transmission cable can thus be detected
• one of the influencing areas is additionally subdivided into two sub-areas, the subdivision into the two sub-areas running perpendicular to the subdivision into the influencing areas.
• the circuit arrangement shown in Fig. 2 is intended for monitoring the error-free and for detecting a faulty state of a system, for.
• B. a cable and chair lift system shown schematically and only in part in FIG. 1, and consists in its basic structure of a plurality of proximity switches 1 and a control and evaluation unit 2.
• the proximity switches 1 are with each other and with the control and evaluation unit 2 connected in series.
• the cable car or chair lift system can be operated at normal speed.
• the circuit arrangement according to the invention includes a large number of proximity switches 1, in a circuit arrangement for monitoring the fault-free and for recognizing a faulty state of a cable car or chair lift system, fifty or more proximity switches 1 may be required without any difficulty — distributed over several hundred meters.
• the proximity switches 1 each have a control input 6 and a control output 7, the control output 7 of the first proximity switch 1 with the control input 6 of the second proximity switch 1, the control output 7 of the second proximity switch 1 with the control input 6 of the third proximity switch 1 and the control output 7 of the third proximity switch 1 is connected to the control input 6 of the fourth proximity switch 1.
• the control input 6 of the first proximity switch 1 is connected to the control output 8 of the control and evaluation unit 2 and is acted upon by this with a clocked, preferably cyclic, reprogrammed signal.
• the control output 7 of the fourth proximity switch 1 is connected to the control input 9 of the control and evaluation unit 2. This serial connection of the individual proximity switches 1 forms the signal line of the circuit arrangement via which the individual proximity switches 1 send the safety-relevant signals to the control and evaluation unit 2.
• the proximity switches 1 and the control and evaluation unit 2 form a ring with respect to the possibility of interrogation and addressing - via corresponding connecting lines 10.
• the addresses and information on the connecting lines 10 are only transmitted in one direction, namely against the transmission direction of the clocked signal, which is given at the control output 8 of the control and evaluation unit 2 to the control input 6 of the first proximity switch 1, i.e. against the transmission direction the safety-relevant signals on the signal line. This ensures that the control and evaluation unit 2 not only notices an interruption in the connection between one of the proximity switches 1, but also determines the location of the error.
• the control and evaluation unit 2 If, for example, the signal line between two proximity switches 1 is interrupted, this is noticed by the control and evaluation unit 2 in that no signal arrives at its control input 9 via the signal line, where the error is located, but cannot be determined in this way. Because the Addressing via the connecting lines 10, however, in the opposite direction to the transmission direction of the signal line, can be determined by successively polling the individual proximity switches 1 via the connecting line 10 and the switching signal of the addressed proximity switch 1 received via the signal line, behind which proximity switch 1 the fault location is located.
• the control and evaluation unit 2 thus begins to query the fourth proximity switch 1 via the connecting line 10. From this, the control and evaluation unit 2 receives a signal back via the signal line and thus knows that the connection from the control and evaluation unit 2 to the fourth proximity switch 1 and the fourth proximity switch 1 itself is error-free. Likewise, the control and evaluation unit 2 subsequently receives a signal back from the third proximity switch 1. However, if the second proximity switch 1 is then queried via the connecting line 10, the control and evaluation unit 2 receives no feedback since it is interrupted. Fault localization by the control and evaluation unit 2 is thus possible.
• the proximity switches 1 can only receive addresses and information via the connecting lines 10 if an enable signal is present on them, which can be received at the proximity switches 1 via enable signal inputs 11.
• the enable signal inputs 11 of all proximity switches 1 are connected to an enable signal output 12 of the control and evaluation unit 2.
• FIG. 3 shows a schematic diagram of the different areas of influence of a preferred proximity switch 1 of a circuit arrangement according to the invention.
• the proximity switch 1 is shown from the side, so that the division of the different spatial influencing areas 3 located above the active surface 13 of the proximity switch 1 becomes clear.
• the sensitive area of the proximity switch 1, which is located above the active surface 13 and corresponds to the sum of the influencing areas 3, is first divided into three areas of influence 3a, 3b and 3c.
• the boundary 14 between the influencing regions 3a - 3b on the one hand and the boundary 15 between the influencing regions 3a - 3c on the other hand run perpendicular to the active surface 13 of the proximity switch 1.
• the influencing region 3a is again divided into two partial regions 3a 'and 3a ", the boundary 16 runs between the partial area 3a 'and the partial area 3a "perpendicular to the boundaries 14 and 15 and parallel to the active surface 13.
• the proximity switches 1 are generally attached in a fixed position to the supports of the cable car or chairlift system, in close proximity to the cable pulleys 5 carrying the cable 4. They are thus at a predetermined distance from the cable 4, the position of which they are to monitor.
• the influencing areas 3a, 3b and 3c of the proximity switches 1 enable the rope 4 to slip sideways relative to the rope pulleys 5.
• a change in the vertical distance of the rope 4 from the active surface 13 can also be determined. Such a change can occur, for example, when the rope pulleys 5 themselves position by loading change, ie pressed down, or if there is wear on the running surfaces 17 of the pulleys 5.
• the boundaries 14, 15 and 16 shown in FIG. 3 for simplification can also have a curved shape, so that the influencing areas 3a, 3b and 3c or the partial areas 3a 'and 3a "no longer have rectangular shapes, but instead can take almost any shape.

Landscapes

• Train Traffic Observation, Control, And Security (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Safety Devices In Control Systems (AREA)
• Alarm Systems (AREA)
• Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
• Monitoring And Testing Of Transmission In General (AREA)
• Testing And Monitoring For Control Systems (AREA)
• Maintenance And Inspection Apparatuses For Elevators (AREA)
• Burglar Alarm Systems (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7849852

Family Applications (1)

Country Status (13)

Cited By (1)

Families Citing this family (17)

Citations (1)

Family Cites Families (18)

• 1997
  • 1997-11-26 DE DE19752362A patent/DE19752362A1/de not_active Withdrawn
• 1998
  • 1998-11-21 ES ES98961226T patent/ES2207865T3/es not_active Expired - Lifetime
  • 1998-11-21 CN CNB988115875A patent/CN1269310C/zh not_active Expired - Lifetime
  • 1998-11-21 AT AT98961226T patent/ATE249696T1/de active
  • 1998-11-21 KR KR1020007005600A patent/KR100711075B1/ko not_active IP Right Cessation
  • 1998-11-21 NZ NZ504750A patent/NZ504750A/en not_active IP Right Cessation
  • 1998-11-21 WO PCT/EP1998/007488 patent/WO1999027649A1/de not_active Application Discontinuation
  • 1998-11-21 DE DE59809596T patent/DE59809596D1/de not_active Expired - Lifetime
  • 1998-11-21 JP JP2000522677A patent/JP3839254B2/ja not_active Expired - Fee Related
  • 1998-11-21 CA CA002310322A patent/CA2310322C/en not_active Expired - Fee Related
  • 1998-11-21 AU AU16713/99A patent/AU743317B2/en not_active Ceased
  • 1998-11-21 US US09/341,691 patent/US6356202B1/en not_active Expired - Lifetime
  • 1998-11-21 EP EP98961226A patent/EP1038354B1/de not_active Expired - Lifetime
• 2000
  • 2000-05-23 NO NO20002643A patent/NO331823B1/no not_active IP Right Cessation

Patent Citations (1)

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